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        <title>再来一波</title>
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    <style>
    .a{
        width:750px;
        background: #fcc;
    }
    .b{
        width:10rem;
        background: #fc0;
        height: 10rem;
    }
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        <!-- 页面结构写在这里 -->
        <div class="a">123</div>
        <div class="b">456</div>
    </body>

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